Exception Handling in Python - Revision history

PeterHarding at 12:45, 19 September 2011

2011-09-19T12:45:59Z

← Older revision		Revision as of 22:45, 19 September 2011
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	self.items = list(new_items)		self.items = list(new_items)

			=Built In Exceptions=

			See [http://docs.python.org/library/exceptions.html here]...
	[[category:Python]]		[[category:Python]]

PeterHarding at 12:45, 19 September 2011

2011-09-19T12:45:08Z

← Older revision		Revision as of 22:45, 19 September 2011
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			A good reference - http://en.wikibooks.org/wiki/Python_Programming/Exceptions

	=Custom Exceptions=		=Custom Exceptions=

PeterHarding at 12:44, 19 September 2011

2011-09-19T12:44:33Z

← Older revision		Revision as of 22:44, 19 September 2011
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	=Custom Exceptions=		=Custom Exceptions=
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	self.items = list(new_items)		self.items = list(new_items)

	Using exceptions, you can emphasize the normal program flow — that ~~usually we just~~ extend the list — rather than creating it:		Using exceptions, you can emphasize the normal program flow — that you extend the list — rather than creating it:

	try:		try:

PeterHarding at 12:44, 19 September 2011

2011-09-19T12:44:05Z

@@ Line 1: / Line 1: @@
@@ Line 15: / Line 14: @@
   try:
-     raise CustomException("My Useful Error Message")
+    raise CustomException("`Useful Error Message")
   except CustomException, (instance):
-     print "Caught: " + instance.parameter
+    print "Caught: " + instance.parameter
 [[category:Python]]

PeterHarding: Created page with ' =Custom Exceptions= Code similar to that seen above can be used to create custom exceptions and pass information along with them. This can be extremely useful when trying to ...'

2011-09-19T12:38:08Z

Created page with ' =Custom Exceptions= Code similar to that seen above can be used to create custom exceptions and pass information along with them. This can be extremely useful when trying to ...'

New page

=Custom Exceptions=

Code similar to that seen above can be used to create custom exceptions and pass information along with them. This can be extremely useful when trying to debug complicated projects. Here is how that code would look; first creating the custom exception class:

class CustomException(Exception):
def __init__(self, value):
self.parameter = value
def __str__(self):
return repr(self.parameter)

And then using that exception:

try:
raise CustomException("My Useful Error Message")
except CustomException, (instance):
print "Caught: " + instance.parameter

[[category:Python]]